“Austrian authorities on Friday announced a third arrest in connection with the foiled conspiracy to attack three now-canceled Taylor Swift concerts, even as disappointed fans charmed Vienna by trading friendship bracelets and singing the pop star’s songs in the streets. The main suspect, a 19-year-old, planned to target onlookers gathered outside Ernst Happel Stadium — up to 30,000 each night, with another 65,000 inside the venue — with knives or homemade explosives during the concert on Thursday or Friday. The suspect hoped to “kill as many people as possible,” authorities said. The 19-year-old main suspect was taken into custody on Tuesday, along with a 17-year-old, officials said. Both are Austrian citizens. The third suspect, an 18-year-old Iraqi citizen, was arrested Thursday evening, the interior minister said at an unrelated news conference Friday.”